ConstantWithOverheadRotationCost

qualtran.surface_code.ConstantWithOverheadRotationCost

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A rotation cost of bitsize - 2 toffoli per rotation independent of the error budget.

Inherits From: RotationCostModel

View aliases

Main aliases

`qualtran.surface_code.rotation_cost_model.ConstantWithOverheadRotationCost`

qualtran.surface_code.ConstantWithOverheadRotationCost(
    bitsize, overhead_rotation_cost
)

This model assumes a state \(\ket{\phi}\) has been prepared using a standard technique, then each rotation is applied with bitsize digits of accuracy using bitsize - 2 Toffoli gates.

\[ \ket{\phi} = \frac{1}{\sqrt{2^{b}}} \sum_{k=0}^{2^b-1} e^{-2\pi i k/2^b} \ket{k} \]

Where \(b\) is the bitsize/number of digits of accuracy.

References

Attributes

bitsize

Number of digits of accuracy for approximating a rotation.

overhead_rotation_cost

The cost model of preparing the initial rotation.

Methods

rotation_cost

View source

rotation_cost(
    error_budget: float
) -> qualtran.resource_counting.GateCounts

Cost of a single rotation.

preparation_overhead

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preparation_overhead(
    error_budget
) -> qualtran.resource_counting.GateCounts

Cost of preparation circuit.

__ne__

__ne__(
    other
)

Check equality and either forward a NotImplemented or return the result negated.

__eq__

__eq__(
    other
)

Method generated by attrs for class ConstantWithOverheadRotationCost.